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Turn, turn, turn. The Shimano SM-BB52B Hollowtech 2 BB Bottom Bracket was made to spin. This Deore level BB delivers efficient performance and is sealed very well. From the standpoint of water.
Better Sealing
Threaded Bottom Bracket
Large Sealed Bearings
Left and Right Cups, Spacers, Inner Covers, and inner O-Rings Included
68/73mm Shell Width
Shimano 24mm Spindles